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Quants Are Rethinking Stock Trades in the Manic Reddit Era

  • Volatile retail flows blamed for vexing low-vol bets, shorting
  • More systematic funds look at trading data to guide models
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Between record dip-buying and the roller coaster in Robinhood Markets Inc., the meme-stock army is running wild across Wall Street again -- making life harder for institutional pros trading popular quant strategies.

With amateurs now commanding roughly one-fifth of U.S. equity volume, a cohort of systematic players suspect the retail billions are undermining time-tested trades like short selling and low-volatility investing.